EP 1569024 A1 20050831 - Optical data storage apparatus
Title (en)
Optical data storage apparatus
Title (de)
Optischer Datenspeicher
Title (fr)
Appareil optique de stockage de données
Publication
Application
Priority
- EP 03006314 A 19990803
- EP 99115299 A 19990803
- JP 26028198 A 19980914
Abstract (en)
An optical system comprising: a light source, a light intensity distribution converting device; and a light converging device for converging parallel light to a spot, wherein the light intensity distribution converting device comprising: a body having a first curved surface transversely extending with respect to a central axis; a second curved surface transversely extending with respect to the central axis; and an outer circumferential surface extending between the first curved surface and the second curved surface, the first curved surface having a concave surface configuration at approximately a center portion thereof, the second curved surface having a convex surface configuration at approximately a center portion thereof, the body being constructed such that the incident light from the light source with a Gaussian light intensity distribution is converted into emerging light with a substantially uniform light intensity distribution, an effective aperture diameter of the light converging device being smaller than an effective emitting aperture diameter of the collimator lens, and the light converging device being arranged within the emerging light with a substantially uniform light intensity distribution emitted from the collimator lens. <IMAGE>
IPC 1-7
IPC 8 full level
G02B 3/00 (2006.01); G02B 3/04 (2006.01); G02B 13/00 (2006.01); G02B 27/09 (2006.01); G11B 7/125 (2006.01); G11B 7/135 (2006.01)
CPC (source: EP US)
G02B 3/0056 (2013.01 - EP US); G02B 3/04 (2013.01 - EP US); G02B 27/09 (2013.01 - EP US); G02B 27/0927 (2013.01 - EP US); G02B 27/0955 (2013.01 - EP US); G11B 7/1374 (2013.01 - EP US); G11B 7/1376 (2013.01 - EP US); G11B 7/1378 (2013.01 - EP US); G11B 7/13922 (2013.01 - EP US); G11B 7/1398 (2013.01 - EP US); G02B 3/0068 (2013.01 - EP US)
Citation (search report)
- [X] EP 0831471 A1 19980325 - SEIKO EPSON CORP [JP]
- [X] US 4904062 A 19900227 - MORISHITA ICHIRO [JP], et al
- [A] EP 0056683 A1 19820728 - DIGITAL RECORDING CORP [US]
- [A] US 4811328 A 19890307 - ITO TETSUO [JP], et al
- [A] US 5231624 A 19930727 - FINEGAN JOEL D [US]
- [A] US 4995709 A 19910226 - IWATA KAZUO [JP], et al
- [A] US 3476463 A 19691104 - KREUZER JUSTIN L
- [A] PATENT ABSTRACTS OF JAPAN vol. 008, no. 194 (E - 264) 6 September 1984 (1984-09-06)
- [A] JAHAN S R ET AL: "REFRACTING SYSTEMS FOR GAUSSIAN-TO-UNIFORM BEAM TRANSFORMATIONS", OPTICS AND LASER TECHNOLOGY,NL,ELSEVIER SCIENCE PUBLISHERS BV., AMSTERDAM, vol. 21, no. 1, 1 February 1989 (1989-02-01), pages 27 - 30, XP000034851, ISSN: 0030-3992
- [A] PATENT ABSTRACTS OF JAPAN vol. 008, no. 245 (P - 312) 10 November 1984 (1984-11-10)
- [A] PATENT ABSTRACTS OF JAPAN vol. 018, no. 606 (P - 1827) 17 November 1994 (1994-11-17)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0987577 A2 20000322; EP 0987577 A3 20010704; CN 1196953 C 20050413; CN 1247992 A 20000322; DE 69939076 D1 20080821; EP 1321795 A2 20030625; EP 1321795 A3 20040107; EP 1569024 A1 20050831; EP 1569024 B1 20080709; JP 2000089161 A 20000331; JP 3370612 B2 20030127; US 2002067549 A1 20020606; US 6356395 B1 20020312; US 6469838 B2 20021022
DOCDB simple family (application)
EP 99115299 A 19990803; CN 99118318 A 19990827; DE 69939076 T 19990803; EP 03006314 A 19990803; EP 05011922 A 19990803; JP 26028198 A 19980914; US 36582499 A 19990803; US 4621902 A 20020116